Carburetor



C W MOTT CARBURETOR.

FILED AuG.5,1919.

Jan. 2, 1923.

wmca UQIZ we MO? Patented uIain.. 2, 11923.

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Application med AAugust 5,

To all whom t may concern.'

Be it known that I, CARL W Mo'rr, a cit1 i zen ofthe United States, residing at Chicago, in the county of VCook and State of Illinois, have invented certain new and useful Improvements in Carburetors, of which the following is a full, clear, and exact,v

fuel mixers for air through the air passage when connected to the intake passage of an internal combustion engine. On the' contrary, the pro# portion of fuel will increase as thev speed of air passing the fuel nozzle is increased.

It is an object, therefore, of my invention to provide means for proportioning the mixture of fuel and air so that the mixture will be maintained substantially constant for varying quantities of air passing the fuel nozzle in a given time.

Another object is to provide a carburetor which will keep the proportion of fuel and airsubstantially constantfor varying loads, and which will do this automatically. These and other4 objects are accomplished by the carburetor hereinafter described and illustrated in the accompanying drawing in which:

Fig. 1 is a'plan view of my carburetor;

Fig. 2 is `a vertical section. on' the line 2-2 0f Fig. l;

Fig. 3 is a vertical view partly in section on the line 3--8 of Fig. 2; and

Fig. 4 isa detail View of the floating venturi'.

I have illustrated.- my invention in connection with a mixing chamber having av casing 11 which is connected to the intake manifold 12 by means of bolts. In the casl ing 11 I have placed a sleeve 13 having a bore 14 which is outwardly flared at each end, thereby forming a venturi. Within this venturi I have placed va ioatingventuri 15 which has a widely flaring `,upper porv tion 15? normally resting upon the upper flared portion of the sleeve 13 and a slightly flared lower portion 15b of less dlameter 191e. serial no. 315,540.

` than the bore of the sleeve 13. A fuef'feedlng nozzle 16 secured to the ioating venturi,

at its throat is regulated by means of a.

, needle valve 17 and a thumb screw 18. rIhe tube 19 which carries the spray nozzle 16 has a hole 20 which is larger than the needle valve 17, forming a passage which connects with the passage 21 inthe vertical arm 22. 'Ihis arm'ext nds down into the fuel reservoir 23 which 1s 'bolted or otherwise secured to the caslng 11. The fuel in this reservoir maybe mamtainedat a constant level by any suitable means, butI prefer to do this by means of the overow pipe 24 and a weir 25, the latter dividing the fuel reservoir into two sections, one of which is supplied with.:

fuel through a supply pipe 26. The floating venturi 15 together with the tube la,

needle valve 17 and the vertical arm 22 are so constructed that they will all be raised and lowered together. A guide pin 27 is' connected to all of these members through the lug 28. This pin extends up through a hole in an extension 11a of'the casing 1,1

and'is threaded at the upper portion feria'- wing nut 29. I have also provided a spring 30 which bears against the lower portion of the extension 11a and a shoulder 271 of the pin 27, thereby -tending to maintain the lventuri in the closed position, as shown in full lines in Fig. 2.'

-When operating under "light loads, the floatingvventuri 15 will 'maintain the posi- 'tion shown in full lines'u When, however, 'the load upon the engine vis increased, the

suction and the resultant increased flow of air will cause tlf-.e floating venturi 15 to be raised somewhat 0E its seat, thereby`allowing air to pass around the venturi 15 and through the ypassage 14. At thesame time, the fuel nozzle 16 will be raised, thereby increasing the distance through which ,fuel must be raised to bring it up to the fuel nozzle, and consequently decreasing the amount of fuel fed by the fuel nozzle rela- L HARVESTER i tive to the amount that lwould have been fed if the nozzle had not Vbeen raised. By a proper p roportioning of these venturis, as well as of the weights of the parts and the strength of the spring 30, I am able to produce a carburetor Which'will keep the ratio of fuel to air substantially constant over quite a wide range of air velocities. If desired, the thumb nut 29 may be turned so as to raise the floating venturi 15, even .the engine.

,rt light loads thereby allowing some air` tol'paas around the venturi and through the assage 14' at all times. lAlso,'if desired, the oad on spring 30 may be adjusted by the nut 29' so that the ratio off fuel to air will be a maximum under .light loads or for:

venturi is raised with increased speed of While I have shown and. described but 'a f be understood that it is capable of many modifications and is not to be limited to a carburetor. for internal combustion engines,v

but is capable of use in any'device for providing a mixture of two or more fluids.

-, Changes, therefore, in the construction and arrangement of parts may be made which do not depart from the spirit and scope of floating venturi will vary the distance of r fing-.iventuri therein a apted to lit starting. and will-*decrease uniformly as theA i reservoir.

'2. In a carburetorgifthd"combination of a through andan o enin inV its wal a floatl as, the flow-'f'fair' therethrough increases, means fori returning the venturi as the flow of air decreases; afuel nozzle extending through .mixing chamber having "af passa e theresaid-opening and secured tothe venturi; a40

jfco'nstant level fuel reservoinf-in connection With the intake end of the nozzle,' whereby the nozzle willvmove Vwith the Iventuri and its distance from the level of the fuel in the reservoir will vary."'withv'thev air flowing throu h the intakef` i f 3. na carburetor, the combination of ar mixing chamber having an opening in its wall, a floating venturi therein adapted to lift with an increased How of air, a constant level fuel reservoir in fixed relation to the mixing chamber, a nozzle havingl a horizontal arm extending through said opening and secured to the venturi to move therewith and .a depending arm movablev in the reservoir, whereby the height of the nozzle above the fuel level in thereservoir' will vary with movements of the venturi.

In testimony whereof I ailix my si ature. f CARL W. v OTT. 

